Chosen Solution
When I connect the unpowered Thunderbolt cable, I can watch the screen from my macbook pro very well, but sometimes the screen in the Apple Thunderbolt Display puts in black. I have to disconnect and connect the cable again and all it´s ok, but this problem it´s continued. There is any possibility to repair this cable?
The cable can be replaced, are you sure the issue is the cable and not something else? Thunderbolt/MagSafe cable assembly Apple P/N 922-9941